US6563197B1 - MOSgated device termination with guard rings under field plate - Google Patents
MOSgated device termination with guard rings under field plate Download PDFInfo
- Publication number
- US6563197B1 US6563197B1 US09/989,217 US98921701A US6563197B1 US 6563197 B1 US6563197 B1 US 6563197B1 US 98921701 A US98921701 A US 98921701A US 6563197 B1 US6563197 B1 US 6563197B1
- Authority
- US
- United States
- Prior art keywords
- field plate
- die
- active area
- termination structure
- guard ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000009792 diffusion process Methods 0.000 claims abstract description 21
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 13
- 229920005591 polysilicon Polymers 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims 3
- 230000015556 catabolic process Effects 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 210000000746 body region Anatomy 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7811—Vertical DMOS transistors, i.e. VDMOS transistors with an edge termination structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/402—Field plates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
Definitions
- This invention relates to semiconductor devices and more specifically relates to a termination structure for a MOSgated device.
- MOSgated semiconductor devices such as MOSFETS, IGBTs and the like must have termination structures surrounding the active device area to prevent breakdown at the peripheral edge of the die or chip.
- the breakdown voltage of MOSgated device is frequently limited by the termination rather than by the active area.
- Termination structures employ conductive field plates and floating guard ring diffusions which are laterally separated from the guard rings. If the termination has a sufficiently high breakdown voltage, it becomes possible to increase the concentration of the epitaxially formed drift region of the active area, thus reducing its resistance R DSON when the device is turned on.
- terminations use a certain silicon area, thus reducing the percentage of the chip area devoted to active area.
- terminations are made to support higher breakdown voltage, they also require more area, thus reducing the active area of a given chip and offsetting the reduced R DSON benefit.
- the guard ring diffusions which are usually spaced from the field plate, and which provide the benefit of grading the electric field from the border of the active region to the street or edge of the die are disposed beneath the field plate. It has been found that the new termination permits a 25% reduction in R DSON of a MOSFET of a given voltage rating and die size because it uses less area, permitting an increase in active area for a given die size, and because it enables an increase in the concentration of the body or drift region.
- the novel termination permitted a decrease in termination area from 1.7 mm 2 to 1.1 mm 2 and a decrease in the resistivity of the epitaxial silicon body region of 5.7 ohm cm to 4.7 ohm cm.
- the on resistance of the die was reduced from about 0.19 ohms to 0.14 ohms.
- FIG. 1 is a cross section of the termination of a prior art MOSFET using a laterally displaced field plate and a set of guard ring diffusions.
- FIG. 2 is a cross section like that of FIG. 1 in which the guard ring diffusions are disposed beneath the filed plate.
- FIG. 1 there is shown a prior art termination for a vertical conduction N channel Power MOSFET comprising a die 10 formed on a monocrystaline N + substrate 11 having an epitaxially deposited N ⁇ layer 12 thereon.
- N ⁇ layer 12 For a device rated at a breakdown voltage of 200 volts, N ⁇ layer 12 has a thickness of 23 microns and a resistivity of 5.7 ohm cm.
- the die may have any desired shape and area and typically may be a rectangle having dimensions of about 2.8 mm by 3.6 mm and 250 microns thick. While the invention is described in connection with an N channel MOSFET device, it will be understood that the invention is applicable to any MOSgated device, including IGBTs and to P channel devices in which all conductivity types to be described are reversed.
- the active section of the device includes P channel diffusion 20 which contain N + sources 21 .
- the outermost channel diffusion 22 is a half cell, as shown in more detail in U.S. Pat. No. 6,180,981.
- Half cell 22 has an overlying field oxide layer 23 and a conductive polysilicon field plate 24 which overlies field oxide 23 and the junction of region 22 .
- a second polysilicon field plate 25 is located atop the field oxide 23 and over P diffusion 26 which extends to the street of the die.
- An LTO insulation oxide 30 overlies field plates 24 and 25 .
- the aluminum source electrode 31 overlies LTO layer 30 and is connected to the source regions 21 and channel regions 21 and 22 in the area shown and to all source and channel regions in the active area.
- the aluminum source electrode 31 is separated at gap 40 to define a gate runner 41 which is connected to polysilicon field plate 24 and to all polysilicon gates, that is, the MOSFET gate poly segment 42 which is internally connected (not shown) to the polysilicon gate lattice of which gate poly 42 is one segment.
- one or more floating guard ring diffusions shown as P diffusions 50 and 51 in FIG. 1, are used. These diffusions are normally placed between the left hand edge of field plate 25 and the right hand edge of field plate 24 . This requires a large lateral dimension and increases the area of the die 10 occupied by the termination region.
- FIG. 2 differs from FIG. 1 in that the P guard ring diffusions 50 and 51 (or any desired number of spaced diffusions) are disposed beneath the field plate 24 .
- the specific spacings used are identified in microns on FIG. 2 for a 200 volt die of dimensions 2.8 mm by 3.6 mm.
- guard rings 50 and 51 saves the lateral space required in the prior art as shown in FIG. 1 since the space between the edge of field plate 24 and the street of the die is considerably reduced (for example, by 47 microns).
- a larger percentage of the die area can be devoted to active area, thus reducing on-resistance.
- the resistivity of the N ⁇ silicon can be decreased (from 5.7 ohm cm to 4.7 ohm cm) when using the invention, to result in a reduction of about 25% in the on-resistance of the prior art die of FIG. 1 .
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Electrodes Of Semiconductors (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Abstract
Description
|
8 | | ||
LTO | ||||
30 | 7,000 | Å | ||
Polysilicon 24, 25 | 10,000 | Å | ||
|
10,000 | Å | ||
P+oxide ( |
3,050 | Å | ||
Gate oxide (beneath |
1,500 | Å | ||
Claims (8)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/989,217 US6563197B1 (en) | 2001-11-20 | 2001-11-20 | MOSgated device termination with guard rings under field plate |
DE10252609.5A DE10252609B8 (en) | 2001-11-20 | 2002-11-12 | Termination for a semiconductor device with MOS gate control with protection rings |
JP2002336979A JP4676670B2 (en) | 2001-11-20 | 2002-11-20 | MOS gate device with guard ring under field plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/989,217 US6563197B1 (en) | 2001-11-20 | 2001-11-20 | MOSgated device termination with guard rings under field plate |
Publications (1)
Publication Number | Publication Date |
---|---|
US6563197B1 true US6563197B1 (en) | 2003-05-13 |
Family
ID=25534885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/989,217 Expired - Lifetime US6563197B1 (en) | 2001-11-20 | 2001-11-20 | MOSgated device termination with guard rings under field plate |
Country Status (3)
Country | Link |
---|---|
US (1) | US6563197B1 (en) |
JP (1) | JP4676670B2 (en) |
DE (1) | DE10252609B8 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050082601A1 (en) * | 2003-10-20 | 2005-04-21 | Wen-Ting Chu | Split gate field effect transistor with a self-aligned control gate |
WO2006135861A2 (en) * | 2005-06-10 | 2006-12-21 | International Rectifier Corporation | Power semiconductor device |
US20070085111A1 (en) * | 2005-09-16 | 2007-04-19 | Jianjun Cao | Termination structure |
US20070090492A1 (en) * | 2005-10-25 | 2007-04-26 | Lawrence Kulinsky | Semiconductor device with capacitively coupled field plate |
CN100440505C (en) * | 2006-09-26 | 2008-12-03 | 无锡博创微电子有限公司 | Depletion type terminal protection structure |
GB2455510A (en) * | 2006-06-12 | 2009-06-17 | Int Rectifier Corp | Power semiconductor device |
US20150034962A1 (en) * | 2013-07-30 | 2015-02-05 | Efficient Power Conversion Corporation | Integrated circuit with matching threshold voltages and method for making same |
US20150303260A1 (en) * | 2014-04-16 | 2015-10-22 | Infineon Technologies Ag | Vertical Semiconductor Device |
CN106057870A (en) * | 2016-06-24 | 2016-10-26 | 上海华虹宏力半导体制造有限公司 | High-voltage NLDMOS device and technique thereof |
US9818862B2 (en) | 2016-01-05 | 2017-11-14 | Nxp Usa, Inc. | Semiconductor device with floating field plates |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006332217A (en) * | 2005-05-25 | 2006-12-07 | Hitachi Ltd | High withstand voltage p-type mosfet and power conversion apparatus using it |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4399449A (en) * | 1980-11-17 | 1983-08-16 | International Rectifier Corporation | Composite metal and polysilicon field plate structure for high voltage semiconductor devices |
US4567502A (en) * | 1981-03-28 | 1986-01-28 | Tokyo Shibaura Denki Kabushiki Kaisha | Planar type semiconductor device with a high breakdown voltage |
US5113237A (en) * | 1988-09-20 | 1992-05-12 | Siemens Aktiengesellschaft | Planar pn-junction of high electric strength |
US5155568A (en) * | 1989-04-14 | 1992-10-13 | Hewlett-Packard Company | High-voltage semiconductor device |
WO1996013857A1 (en) * | 1994-10-31 | 1996-05-09 | Ixys Corporation | Stable high voltage semiconductor device structure |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04127540A (en) * | 1990-09-19 | 1992-04-28 | Nec Corp | Insulated-gate field-effect transistor |
US5381031A (en) * | 1993-12-22 | 1995-01-10 | At&T Corp. | Semiconductor device with reduced high voltage termination area and high breakdown voltage |
JP4054155B2 (en) * | 2000-02-01 | 2008-02-27 | 三菱電機株式会社 | Semiconductor device |
-
2001
- 2001-11-20 US US09/989,217 patent/US6563197B1/en not_active Expired - Lifetime
-
2002
- 2002-11-12 DE DE10252609.5A patent/DE10252609B8/en not_active Expired - Fee Related
- 2002-11-20 JP JP2002336979A patent/JP4676670B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4399449A (en) * | 1980-11-17 | 1983-08-16 | International Rectifier Corporation | Composite metal and polysilicon field plate structure for high voltage semiconductor devices |
US4567502A (en) * | 1981-03-28 | 1986-01-28 | Tokyo Shibaura Denki Kabushiki Kaisha | Planar type semiconductor device with a high breakdown voltage |
US5113237A (en) * | 1988-09-20 | 1992-05-12 | Siemens Aktiengesellschaft | Planar pn-junction of high electric strength |
US5155568A (en) * | 1989-04-14 | 1992-10-13 | Hewlett-Packard Company | High-voltage semiconductor device |
WO1996013857A1 (en) * | 1994-10-31 | 1996-05-09 | Ixys Corporation | Stable high voltage semiconductor device structure |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050082601A1 (en) * | 2003-10-20 | 2005-04-21 | Wen-Ting Chu | Split gate field effect transistor with a self-aligned control gate |
WO2006135861A3 (en) * | 2005-06-10 | 2007-05-18 | Int Rectifier Corp | Power semiconductor device |
WO2006135861A2 (en) * | 2005-06-10 | 2006-12-21 | International Rectifier Corporation | Power semiconductor device |
US20060286732A1 (en) * | 2005-06-10 | 2006-12-21 | International Rectifier Corporation | Power semiconductor device |
US7385273B2 (en) * | 2005-06-10 | 2008-06-10 | International Rectifier Corporation | Power semiconductor device |
US7679111B2 (en) * | 2005-09-16 | 2010-03-16 | International Rectifier Corporation | Termination structure for a power semiconductor device |
US20070085111A1 (en) * | 2005-09-16 | 2007-04-19 | Jianjun Cao | Termination structure |
US7525178B2 (en) * | 2005-10-25 | 2009-04-28 | International Rectifier Corporation | Semiconductor device with capacitively coupled field plate |
US20070090492A1 (en) * | 2005-10-25 | 2007-04-26 | Lawrence Kulinsky | Semiconductor device with capacitively coupled field plate |
GB2455510A (en) * | 2006-06-12 | 2009-06-17 | Int Rectifier Corp | Power semiconductor device |
CN100440505C (en) * | 2006-09-26 | 2008-12-03 | 无锡博创微电子有限公司 | Depletion type terminal protection structure |
US9214399B2 (en) * | 2013-07-30 | 2015-12-15 | Efficient Power Conversion Corporation | Integrated circuit with matching threshold voltages and method for making same |
US20150034962A1 (en) * | 2013-07-30 | 2015-02-05 | Efficient Power Conversion Corporation | Integrated circuit with matching threshold voltages and method for making same |
US9583480B2 (en) | 2013-07-30 | 2017-02-28 | Efficient Power Conversion Corporation | Integrated circuit with matching threshold voltages and method for making same |
US20150303260A1 (en) * | 2014-04-16 | 2015-10-22 | Infineon Technologies Ag | Vertical Semiconductor Device |
CN105047714A (en) * | 2014-04-16 | 2015-11-11 | 英飞凌科技股份有限公司 | Vertical semiconductor device |
CN105047714B (en) * | 2014-04-16 | 2018-11-02 | 英飞凌科技股份有限公司 | Vertical semiconductor devices |
US10957764B2 (en) * | 2014-04-16 | 2021-03-23 | Infineon Technologies Ag | Vertical semiconductor device |
US9818862B2 (en) | 2016-01-05 | 2017-11-14 | Nxp Usa, Inc. | Semiconductor device with floating field plates |
CN106057870A (en) * | 2016-06-24 | 2016-10-26 | 上海华虹宏力半导体制造有限公司 | High-voltage NLDMOS device and technique thereof |
Also Published As
Publication number | Publication date |
---|---|
JP4676670B2 (en) | 2011-04-27 |
JP2003158266A (en) | 2003-05-30 |
DE10252609B8 (en) | 2018-03-29 |
DE10252609A1 (en) | 2003-05-28 |
DE10252609B4 (en) | 2018-02-08 |
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Owner name: INTERNATIONAL RECTIFIER CORPORATION, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WAGERS, KENNETH;MA, YANPING;CAO, JIANJUN;REEL/FRAME:012317/0880;SIGNING DATES FROM 20011102 TO 20011108 |
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Owner name: INFINEON TECHNOLOGIES AMERICAS CORP., CALIFORNIA Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL RECTIFIER CORPORATION;REEL/FRAME:046612/0968 Effective date: 20151001 |